A066805 - cp's OEIS frontend

A066805 a(n) is the least k such that n + Sum_{i=1..k} A018252(i) is prime; or 0 if none exists.

n	a(n)
1	1
2	1
3	5
4	1
5	6
6	1
7	8
8	2
9	5
10	1
11	7
12	1
13	5
14	2
15	5
16	1
17	7
18	1
19	5
20	3
21	6
22	1
23	6
24	2
25	5
26	2
27	13
28	1
29	6
30	1
31	5
32	2
33	5
34	4
35	6
36	1
37	8
38	2
39	5
40	1
41	6
42	1
43	5
44	10
45	5
46	1
47	7
48	2
49	8
50	3
51	5
52	1
53	7
54	2
55	5
56	2
57	7
58	1
59	6
60	1
61	5
62	2
63	6
64	4
65	6
66	1
67	8
68	2
69	5
70	1
71	6
72	1
73	5
74	2
75	5
76	27
77	7
78	1
79	5
80	11
81	5
82	1
83	15
84	2
85	5

[1, 1, 5, 1, 6, 1, 8, 2, 5, 1, 7, 1, 5, 2, 5, 1, 7, 1, 5, 3, 6, 1, 6, 2, 5, 2, 13, 1, 6, 1, 5, 2, 5, 4, 6, 1, 8, 2, 5, 1, 6, 1, 5, 10, 5, 1, 7, 2, 8, 3, 5, 1, 7, 2, 5, 2, 7, 1, 6, 1, 5, 2, 6, 4, 6, 1, 8, 2, 5, 1, 6, 1, 5, 2, 5, 27, 7, 1, 5, 11, 5, 1, 15, 2, 5]

cp's OEIS Frontend

A066805 a(n) is the least k such that n + Sum_{i=1..k} A018252(i) is prime; or 0 if none exists.

Table of values

List of values

n	a(n)
1	1
2	1
3	5
4	1
5	6
6	1
7	8
8	2
9	5
10	1
11	7
12	1
13	5
14	2
15	5
16	1
17	7
18	1
19	5
20	3
21	6
22	1
23	6
24	2
25	5
26	2
27	13
28	1
29	6
30	1
31	5
32	2
33	5
34	4
35	6
36	1
37	8
38	2
39	5
40	1
41	6
42	1
43	5
44	10
45	5
46	1
47	7
48	2
49	8
50	3
51	5
52	1
53	7
54	2
55	5
56	2
57	7
58	1
59	6
60	1
61	5
62	2
63	6
64	4
65	6
66	1
67	8
68	2
69	5
70	1
71	6
72	1
73	5
74	2
75	5
76	27
77	7
78	1
79	5
80	11
81	5
82	1
83	15
84	2
85	5

n	a(n)
1	1
2	1
3	5
4	1
5	6
6	1
7	8
8	2
9	5
10	1
11	7
12	1
13	5
14	2
15	5
16	1
17	7
18	1
19	5
20	3
21	6
22	1
23	6
24	2
25	5
26	2
27	13
28	1
29	6
30	1
31	5
32	2
33	5
34	4
35	6
36	1
37	8
38	2
39	5
40	1
41	6
42	1
43	5
44	10
45	5
46	1
47	7
48	2
49	8
50	3
51	5
52	1
53	7
54	2
55	5
56	2
57	7
58	1
59	6
60	1
61	5
62	2
63	6
64	4
65	6
66	1
67	8
68	2
69	5
70	1
71	6
72	1
73	5
74	2
75	5
76	27
77	7
78	1
79	5
80	11
81	5
82	1
83	15
84	2
85	5

n	a(n)
1	1
2	1
3	5
4	1
5	6
6	1
7	8
8	2
9	5
10	1
11	7
12	1
13	5
14	2
15	5
16	1
17	7
18	1
19	5
20	3
21	6
22	1
23	6
24	2
25	5
26	2
27	13
28	1
29	6
30	1
31	5
32	2
33	5
34	4
35	6
36	1
37	8
38	2
39	5
40	1
41	6
42	1
43	5
44	10
45	5
46	1
47	7
48	2
49	8
50	3
51	5
52	1
53	7
54	2
55	5
56	2
57	7
58	1
59	6
60	1
61	5
62	2
63	6
64	4
65	6
66	1
67	8
68	2
69	5
70	1
71	6
72	1
73	5
74	2
75	5
76	27
77	7
78	1
79	5
80	11
81	5
82	1
83	15
84	2
85	5